地形分類図とDEMを活用した磐梯火山のハザードマップに関する地理情報解析

抄録

 This paper analyzes a volcanic hazard map using grid DEMs and vector GIS data, such as landform classification polygons shown on the Land Condition Map of Bandai Volcano which was published by the Geographical Survey Institute. The hazard areas described on the hazard map of Bandai Volcano, landform classification on a land condition map and morphometric data derived from 50-m and 10-m grid DEMs were overlaid using GIS. The results indicate that the expected hazard areas on the hazard map correspond to the past hazard areas shown on the land condition map. Because large-scale collapses of the volcanic body occurred many times as major processes of landform evolution, the areas underlain by past debris avalanche deposits shown on the land condition map are important for discussing disaster prevention. The result of the landform analysis using the 50-m DEM corresponds to a rough landform classification, whereas the result using the 10-m DEM reflects micro-scale landforms.